-lqokwood



2 Sheets-Sheet 1.

Patented June 22,1880.

(No Model.)

R. M. LOGKWOOD 80 S; H. BARTLETT. Transmitter and Repeater for Telephones.

M G a VVitne Sses: v

I (No Model.) ZSheqts-Sheet 2..

R. M. LOCK'WOOD &S. H.' BARTLETT. Transmitter and Re pe abtenfor Telephones.

No. 229,151. Patented June 1 880.

UNITED STATES PATENT ()FEIGE.

ROBERT M. LOGKWOQD AND SAMUEL H. BARTLETT, OF NEW YORK, N. Y., ASSIGNOBS OF ONEJEIALF OF THEIR RIGHT TO CHARLES F. LIVERMORE,

OF SAME PLACE.

TRANSMITTER AND REPEATER FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 229,151, dated June 22, 1880.

Application filed March 9, 1880. (No model.)

To all whom it may concern Be it known that we, ROBERT M. LOGKWOOD and SAMUEL H. BARTLETT, of the city, county, and State of New York, have invented certain new and useful Improvements in Transmitters and Repeaters for "Telephones or Vocal Telegraphs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of to thisspecification, in which- Figure 1 represents avertical section through our improved transmitting apparatus. Fig. 2 is a similar view of the same apparatus arranged to act as a repeater; and Fig.3 is a 1 5 perspective view of the magnet, carbon, or conducting plates or bars and insulators detached or removed from the non-resonant block.

Similar letters of reference denote corresponding parts wherever used.

Our invention relates to a novel construction of transmitter for telephones or vocal telegraphs,whereby said transmitter is adapted also to act as a repeater for repeating the vocal sounds and sending over new main -line 2 5 wires with independent batteries, as hereinafter described.

In telephones as heretofore constructed, so

. far as we are aware, reliance for the transmission of sounds has been placed mainly on the 0 induced current, and great difficulty has been experienced in the use of this current, for the reason that it is weak and uncertain in its action and liable to jump from the conductingwires to neighboring conductors or wires.

This current has been employed in preference to the direct or battery current on account of the extremely delicate or sensitive diaphragms or equivalent devices used for the reception of the sound-waves,which rendered it imprac- 0 ticable to use a direct current of SllffiGlBllli power to transmit the vocal sounds to any considerable distance, owing to the fact that in the use of such current the diaphragms employed, are firmly grasped and held by the 'in- 4 5 ,terposed magnet, and their further vibration under the action of the sound-waves is checked, rendering them practically inoperative for the purpose intended.

The construction of transmitter by which we dispense with this diaphragm and the mechanical vibration referred to, thereby enabling us to use the direct current, is set forth in another application of even date herewith. Our improvementthereon, herein described, consists in adding to the transmitter, consisting of the non-resonant block with its carbon bars or plates and button therein described, a magnet and helices interposed in, the block in the main-line current, thereby greatly increasing its power as a transmitter and adapting it, with a proper adjustment or arrangement of the connecting-wires, to act as a repeater, for taking up and repeating a vocal telegram to a new circuit or circuits forming extensions of the first, and operated by independent batteries, as in the case of ordinary telegraphic communication.

In the accompanying drawings, A represents a base-plate of wood or other suitable material, upon which is secured ablock, B, of cor or other non-resonant material, made eit er polygonal or cylindrical in form, that shown approximating the form of a cube. Near its upper end the block B has strips or bars I) b, of carbon or other suitable conducting material, embedded in it, said strips extending transversely across the block from the sides to near the center, where they are separated by a short intervening space, a button, b serving to bridge said space and connect the two bars, in a manner similar to that described in another application filed herewith. Underneath the plates 1) b are placed strips or plates 0 c, of rubber or other non-conducting material,resting over-the arms dd of a magnet, D, said arms penetrating the base-plate A and block B, with their ends resting in contact with the insulators c 0. Wooden pins 0 6 pass through the carbon and insulating plates into sockets in the ends of the magnet, connecting the carbon plates therewith and preventing displacement of the parts.

In order to afford access to the removable button b an aperture is madein the block B directly over said button, which, when the parts are in place, is filled by a plug, B, of

the insulators, as shown, these helices being formedin "the usual or any preferred "m'ann er;

The base-plate A has suitable screw or binding posts G G applied to it for facilitating the attachment, removal, or transfer of the wires,

the same as in an ordinary telegraphin-g in= strument, the cyebolts or pins 9 9 represent. ing thepoints of attachment of the main-line runningthroughtherequisite-seriesof circuits rwithisimilar repeaters until the message is dewirestosaidposts;

In the arrangement of the devices as a trans? mitter simply, as shown in Fig. 1, the wiresiof theapparatus scare arranged vas follows: slwnt irenh, e t nds rom t qrewriles G upt and is united to the carbon or conduct; ingzplate bin any suitable manner, saidwi-re te m ating a sa p e- 1 m t e a p end of rplate rb proceeds I a secondwire, h,

1. which passes downward outside the block to then f; t lo -6 ldv h F, Where itpenetrates theblock, and, wrappin g the P-001 111213116; usual manner, forms said helix, after which itpasses through; the intervening partit-iong'a o f the'blocl; to andwraps the, ,seeond speol, forming the helix F in the same in anner; Fr m th s po h Wi e ip s sou t o perforation in the :block opposite to whereit entered, and I thence around said block and downioithe screw-post G,whereitsendisse cured inanypreferred manner. By now attaching the main-line wires .a ndthe battery withithe connecting pinsig g in thescrew-posts, the-same as in a telegraph-instrument, the apparajtus,as agtransmitter, is complete and ready foraction, The soundsare received upon thersurface of the non-resonant bloc k B, nM wethr ughwha ,We mnv mo cul and electrical action,;are' transmitted to the carbon onconducting bars firmly fastened; to

9 i m eddedi-inthe-bl ck a; t then t t fii fieri ven'in g button, resting thereon by, its ,,ow n weight, molecularly agitating ordis'turbin g the latter. [Dhe button being in the :main-lin ecur- 1 re1-1t,@1-the; latter. is, corresponding-1y disturbed,

anclKt-he molecular dist ba me O 'h -sb being in unison-with the soundwavesreeeiyed upon thelsurfaceof the block 13, the latter are, :trans'niitted over the wires to the desired .InfFig. ;2 wehave showna similar apparatus arranged to act as airepeater, the-construction bein gthe sameas in the case fthe transmit- .ter, JEi-g, 1,, the idifferencebetween the two consistingin the arrangement of thewires, The

mainline wires :from the transmitter connect with the pinsy g,, a nd ;thence ,th;rough; the screw-posts Gr .Gfandwire Ifimhich corresponds withthenvireih! ofii-Figl-l in t t tv xtend fromthepost-G through the block forming rectlywith theearbon as in..F.ig. 1, it passes down to the. screw-postrGn, and thus completes the first main-line circuit. The action of the disturbed electric current upon the magnet in passing over the helices F F causes similar in turn, is transmitted through the non-resonant body'B- and pins 0 e"-to the-carbon plates livered at the desired point.

By this arrangement of repeaters. and hats teries with-extending circuits "we areen'abled to utilize the direct current, and thereby to transmit 'vocal sounds any required distance,

molecular disturbance of the magnet, which,

with-thesalne precision and inf-like manner aslqordin'ary telegraphic communications are nowsenadiffering only in. the ,tral sin itting,, 1?6- peating, and receiving devices. Theinbn-resonant block, with, its embedded conductors, and provided withthe' magnet, {as

described, answers lwellralso 'asa receiver, and

maybe used as such.v Another, and preferred form of a (receiver is, however, des'cribedjin another application of even [date herewith.

The sleeves described in another application filedherewith for'destroyingthe induction-1mm rent may be employed also with'thie helices F F with .like'beneficial results, We are aware that .it' is not new to usejcar- IOO bon. contacts for repeating from one circuit'to another of a telephone li'ne', and we fmakeno claim, broadly," .to"the same but our inven tion' differs from any previous arrangemen t'of which we are aware in that we use ,no'armatu'reordiaphrag'm between the magnet and the carbon. I

Having ,now described our"invention',f-we la .m .4

1 Thenon-reson'antjblock in which the carbon Ior co'nducting'plates are secured, in com bination" with .a' magnet 'orf magnets thereto, substantially asfdes'crib'edg' I M 2.1mm {non "resonant block provided with the carbon plates and; interposed button ,in Combination withthe magnet'ja-nd' helices .ap-

IIO

applied plied. thereto 'andoperating substantially 'as '1 described} 1 y p v 3'. Theconibination ofanon-resonant block, strips, and button ,of c'arbon or equivalent conducting 'materialand a magnet arrange'dfl and operating 's'ubstantially'a's' described.

j 4. TheIc'a'rbon'v bars or conductors, separated from themagnet by' insulators, in combination with the wooden pins penetrating the insulators-and connecting the carbon bar or plates with themjagnjet, substantiallyas "describ d 5. C Dhevcoinbinatio'n, ;infa vocal-sound transmitter or repeater, of 'immovabl'y'embedd'ed carbon strips or conductors and a magnet, snlators c c, and connecting-pins e 6', all areither permanent or electromagnetic, the heranged substantially as and for the purpose 1o lices of Which, together with the carbon strips, described. are adapted to be interposed in the direct or ROBT. M. LOOKWOOD. 5 main-line current, substantially as described. SAMUEL H. BARTLETT.

6. The combination, with the non-resonant Witnesses:

block B, of the magnet D, helices F F, carbon ALEX. MAHON, bars or conductors b b, interposed button, in- F. L. OURAND. 

